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• GRUB2 stuck at rescue console, showing "unknown filesystem" for all partitions

  - by AndiDog

  I installed Ubuntu 12.04 on my external USB drive, where I have a 700GB NTFS partition followed by the new 6GB ext4 partition and a swap partition (all primary). The GRUB MBR is also installed to the external hard disk. Since my BIOS puts the external drive as first disk when booting, I removed my internal hard disk before installation in order to avoid ordering problems. Now when I boot from the external drive, GRUB is stuck at the rescue console with the error "unknown filesystem". grub rescue> ls (hd0) (hd0,msdos3) (hd0,msdos2) (hd0,msdos1) ls (hd0,<any of them>)/ gives me "unknown filesystem", thus also "insmod normal" GRUB doesn't seem to be able to read my Linux partition as you can see above?! How can I solve this? Additional info: bootinfoscript says (this is with the internal drive in again, but that does not make a difference): Grub2 (v1.99) is installed in the MBR of /dev/sdb and looks at sector 1 of the same hard drive for core.img. core.img is at this location and looks for (,msdos2)/boot/grub on this drive. sdb1: __________________________________________________________________________ File system: ntfs Boot sector type: Windows Vista/7: NTFS Boot sector info: No errors found in the Boot Parameter Block. Operating System: Boot files: sdb2: __________________________________________________________________________ File system: ext4 Boot sector type: - Boot sector info: Operating System: Ubuntu 12.04 LTS Boot files: /boot/grub/grub.cfg /etc/fstab /boot/grub/core.img sdb3: __________________________________________________________________________ File system: swap Boot sector type: - Boot sector info:

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• Difference between "traceroute" and "traceroute -U"

  - by AndiDog

  The manpage of traceroute says that the "-U" parameter (UDP probing) is the default, but I'm getting different results every time. With "-U": traceroute -U www.univ-paris1.fr traceroute to www.univ-paris1.fr (193.55.96.121), 30 hops max, 60 byte packets [...] 13 rap-vl165-te3-2-jussieu-rtr-021.noc.renater.fr (193.51.181.101) 59.445 ms 56.924 ms 56.651 ms [...] 18 * paris1web.univ-paris1.fr (193.55.96.121) 23.797 ms 23.603 ms but the normal traceroute gives me another result (never reaches the final node) - it's either "!X" or just exits after the maximum of 30 hops: traceroute www.univ-paris1.fr traceroute to www.univ-paris1.fr (193.55.96.121), 30 hops max, 60 byte packets [...] 11 te1-1-paris1-rtr-021.noc.renater.fr (193.51.189.38) 28.147 ms 28.250 ms 28.538 ms [... non-responding nodes ...] 28 site-1.03-jussieu.rap.prd.fr (195.221.126.58) 85.941 ms !X * * Note: I tried this very often and always get the same results. The path in my local network is always the same. So what does the "-U" parameter actually change here? I'm especially interested what the reason for "!X" could be (communication administratively prohibited). EDIT: If that helps, paris-traceroute gives me the following for the last hop: 14 P(1, 6) site-1.03-jussieu.rap.prd.fr (195.221.126.58) 34.938 ms !5 !T2 which means that node discards the packet with TTL=2 and returns an unknown message (not "destination unreachable" or the like).

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• Java JRE: Setting default heap size

  - by AndiDog

  I'm having trouble with Java on a virtual server, it always gives me the following error: # java Error occurred during initialization of VM Could not reserve enough space for object heap Could not create the Java virtual machine. I first solved this by using the CACAO virtual machine (of OpenJDK, by putting it first in jvm.cfg), but then I run into problems with my web application (Play! framework based, gives me nasty LinkageErrors). So I cannot use that VM. Instead I'd like to just use the normal server VM and set -Xmx128M by default. How can I do that? Related: this question

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• How can the Three-Phase Commit Protocol (3PC) guarantee atomicity?

  - by AndiDog

  I'm currently exploring worst case scenarios of atomic commit protocols like 2PC and 3PC and am stuck at the point that I can't find out why 3PC can guarantee atomicity. That is, how does it guarantee that if cohort A commits, cohort B also commits? Here's the simplified 3PC from the Wikipedia article: Now let's assume the following case: Two cohorts participate in the transaction (A and B) Both do their work, then vote for commit Coordinator now sends precommit messages... A receives the precommit message, acknowledges, and then goes offline for a long time B doesn't receive the precommit message (whatever the reason might be) and is thus still in "uncertain" state The results: Coordinator aborts the transaction because not all precommit messages were sent and acknowledged successfully A, who is in precommit state, is still offline, thus times out and commits B aborts in any case: He either stays offline and times out (causes abort) or comes online and receives the abort command from the coordinator And there you have it: One cohort committed, another aborted. The transaction is screwed. So what am I missing here? In my understanding, if the automatic commit on timeout (in precommit state) was replaced by infinitely waiting for a coordinator command, that case should work fine.

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• XSD string pattern independent of leading/trailing space

  - by AndiDog

  I have a XSD simple type that should match UUIDs: <simpleType name="UuidT"> <restriction base="string"> <pattern value="[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}" /> </restriction> </simpleType> It correctly matches the following content: <!-- valid --> <Uuid>12345678-1234-5678-9012-123456789012</Uuid> But it doesn't match content that contains excess whitespace: <!-- not valid --> <Uuid> 2de25a81-b117-4b2a-b910-50f0878884f7 </Uuid> Sure, I could add \s* to both sides of the regex, but isn't there a simpler solution in XSD?

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• XSD: Different sub-elements depending on attribute/element value

  - by AndiDog

  Another XSD question - how can I achieve that the following XML elements are both valid: <some-element> <type>1</type> <a>...</a> </some-element> <some-element> <type>2</type> <b>...</b> </some-element> The sub-elements (either <a> or <b>) should depend on the content of <type> (could also be an attribute). It would be so simple in RelaxNG - but RelaxNG doesn't support key integrity :( Is there a way to implement this in XSD? Note: XML schema version 1.1 supports <xs:alternative>, which might be a solution, but afaik no reference implementation (e.g. libxml2) supports this yet. So I'm searching for workarounds. The only way I've come up with is: <type>1</type> <some-element type="1"> <!-- simple <xs:choice> between <a> and <b> goes here --> <a>...</a> </some-element> <!-- and now create a keyref between <type> and @type -->

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• Django i18n: makemessages only on site level possible?

  - by AndiDog

  I have several strings in my site that don't belong to any app, for example {% block title %}{% trans "Login" %}{% endblock %} or a modified authentication form used to set the locale cookie class AuthenticationFormWithLocaleOption(AuthenticationForm): locale = forms.ChoiceField(choices = settings.LANGUAGES, required = False, initial = preselectedLocale, label = _("Locale/language")) Now when I execute django-admin.py makemessages --all -e .html,.template in the site directory, it extracts the strings from all Python, .html and .template files, including those in my apps. That is because I develop my apps inside that directory: Directory structure: sitename myapp1 myapp2 Is there any way to extract all strings that are not in my apps? The only solution I found is to move the app directories outside the site directory structure, but I'm using bzr-externals (similar to git submodules or svn externals) so that doesn't make sense in my case. Moving stuff that needs translation into a new app is also possible but I don't know if that is the only reasonable solution.

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• Custom GMapTypeControl buttons (Google Maps V2 API)

  - by AndiDog

  A similar question was already asked, but does not have a satisfying answer. I want to change the CSS style for the map type selection buttons (which are actually DIVs that don't have a CSS class). The links in the referenced question show how to subclass controls, but the examples don't seem to work for GMapTypeControl. Tried the following function CustomGMapTypeControl() {} CustomGMapTypeControl.prototype = new GMapTypeControl() CustomGMapTypeControl.prototype.setButtonStyle_ = function(button) { button.style.backgroundColor = "red"; } but the setButtonStyle_ function doesn't even get called. Any solutions for this?

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